PUBLIC LAWS--CH. 777-OCT. 9 , 1940 Proviso. Applicabilityof sub- section (3). "Passenger-carrying vessel" defined. 50 Stat. 1121. Transportation of dry fulminates in bulk, etc. Transportation of high explosives on passenger-carrying vessels. Transportation of high explosives on other vessels. Transportation of other explosives. Proviso. Applicability to drums, etc., of certain combustible liquids. Nonapplicability of subsection (6) to cer- tain vessels, etc. purpose of carrying inflammable or combustible liquid cargo in bulk in its own tanks: Provided, That the provisions of subsection (3) of this section shall apply to every such vessel subject to the provisions of section 4417a of the Revised Statutes, as amended, which is con- structed or converted for the principal purpose of carrying inflam- mable or combustible liquid cargo in bulk in its own tanks. "(2) The phrase 'passenger-carrying vessel' as used in this section, when applied to a vessel subject to any provision of the International Convention for Safety of Life at Sea, 1929, means a vessel which carries or is authorized to carry more than twelve passengers. "(3) It shall be unlawful knowingly to transport, carry, convey, store, stow, or use on board any vessel fulminates or other detonating compounds in bulk in dry condition, or explosive compositions that ignite spontaneously or undergo marked decomposition when sub- jected for forty-eight consecutive hours to a temperature of one hundred and sixty-seven degrees Fahrenheit, or compositions con- taining an ammonium salt and a chlorate, or other like explosives. "(4) It shall be unlawful knowingly to transport, carry, convey, store, stow, or use on board any passenger-carrying vessel any high explosives such as, and including, liquid nitroglycerin, dynamite, trinitrotoluene, picrates, detonating fuzes, fireworks that can be ex- ploded en masse, or other explosives susceptible to detonation by a blasting cap or detonating fuze, except ships' signal and emergency equipment, and samples of such explosives (but not including liquid nitroglycerin) for laboratory or sales purposes in restricted quan- tities as may be permitted by regulations of the Secretary of Com- merce established hereunder. "(5) It shall be unlawful knowingly to transport, carry, convey, store, stow, or use on board any vessel other than a passenger-carrying vessel, any high explosive referred to in subsection (4) hereof except as permitted by the regulations of the Secretary of Commerce estab- lished hereunder. "(6) (a) It shall be unlawful knowingly to transport, carry, convey, store, stow, or use (except as fuel for its own machinery) on board any vessel, except one specifically exempted by paragraph (b) of this subsection, any other explosives or other dangerous articles or sub- stances, including inflammable liquids, inflammable solids, oxidizing materials, corrosive liquids, compressed gases, poisonous articles or substances, hazardous articles, and ships' stores and supplies of a dan- gerous nature, except as permitted by the regulations of the Secretary of Commerce established hereunder: Provided, That all of the provi- sions of this subsection relating to the transportation, carrying, con- veying, storing, stowing, or use of explosives or other dangerous articles or substances shall apply to the transportation, carrying, conveying, storing, stowing, or using on board any passenger vessel of any barrels, drums, or other packages of any combustible liquid which gives off inflammable vapors (as determined by flash-point in open cup tester as used for test of burning oil) at or below a tem- perature of one hundred and fifty degrees Fahrenheit and above eighty degrees Fahrenheit. "(b) This subsection shall not apply to- "(i) vessels not exceeding fifteen gross tons when not engaged in carrying passengers for hire; "(ii) vessels used exclusively for pleasure; "(iii) vessels not exceeding five hundred gross tons while engaged in the fisheries; "(iv) tugs or towing vessels: Provided, however, That any such vessel, when engaged in towing any vessel that has explosives inflammable liquids, or inflammable compressed gases on board 1024 [54 STAT.